Widely tunable THz-wave generation using LiNbO3 optical parametric oscillator and its application to differential imaging

Kodo Kawase; Junichi Shikata; Tetsuo Taniuchi; Hiromasa Ito

Widely tunable THz-wave generation using LiNbO₃ optical parametric oscillator and its application to differential imaging

Kodo Kawase, Junichi Shikata, Tetsuo Taniuchi, Hiromasa Ito

Advanced Interdisciplinary Research Division

Research output: Contribution to journal › Conference article › peer-review

4 Citations (Scopus)

Abstract

We had recently demonstrated a room temperature operated widely tunable THz-wave generation (frequency : 0.9-2.1 THz, wavelength : 140-310 μm) introducing a Si prism coupler onto a LiNbO₃ crystal which was pumped by a Q-switched Nd:YAG laser. The process involved is an optical parametric oscillation (OPO) utilizing the polariton mode scattering of LiNbO₃. This tunable THz-wave source was applied to the problem of differential imaging. In a proof-of-concept experiment, we optically tagged objects embedded in a shade and measured the difference between transmittance at two wavelengths. The image of a tagged object was emphasized in comparison with that of an untagged objects. Differential THz imaging has not been reported previously, to our knowledge, mainly because of the lack of convenient tunable THz-wave sources. It seems possible to use dual-wavelength differential transmittance spectroscopy in the THz-wave region to monitor the gases in the industry.

Original language	English
Pages (from-to)	20-26
Number of pages	7
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3465
Publication status	Published - 1998 Dec 1
Event	Proceedings of the 1998 Conference on Millimeter and Submillimeter Waves IV - San Diego, CA, USA Duration: 1998 Jul 20 → 1998 Jul 23

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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Widely tunable THz-wave generation using LiNbO₃ optical parametric oscillator and its application to differential imaging. / Kawase, Kodo; Shikata, Junichi; Taniuchi, Tetsuo; Ito, Hiromasa.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3465, 01.12.1998, p. 20-26.

Research output: Contribution to journal › Conference article › peer-review

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title = "Widely tunable THz-wave generation using LiNbO3 optical parametric oscillator and its application to differential imaging",

abstract = "We had recently demonstrated a room temperature operated widely tunable THz-wave generation (frequency : 0.9-2.1 THz, wavelength : 140-310 μm) introducing a Si prism coupler onto a LiNbO3 crystal which was pumped by a Q-switched Nd:YAG laser. The process involved is an optical parametric oscillation (OPO) utilizing the polariton mode scattering of LiNbO3. This tunable THz-wave source was applied to the problem of differential imaging. In a proof-of-concept experiment, we optically tagged objects embedded in a shade and measured the difference between transmittance at two wavelengths. The image of a tagged object was emphasized in comparison with that of an untagged objects. Differential THz imaging has not been reported previously, to our knowledge, mainly because of the lack of convenient tunable THz-wave sources. It seems possible to use dual-wavelength differential transmittance spectroscopy in the THz-wave region to monitor the gases in the industry.",

author = "Kodo Kawase and Junichi Shikata and Tetsuo Taniuchi and Hiromasa Ito",

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AU - Kawase, Kodo

AU - Shikata, Junichi

AU - Taniuchi, Tetsuo

AU - Ito, Hiromasa

PY - 1998/12/1

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N2 - We had recently demonstrated a room temperature operated widely tunable THz-wave generation (frequency : 0.9-2.1 THz, wavelength : 140-310 μm) introducing a Si prism coupler onto a LiNbO3 crystal which was pumped by a Q-switched Nd:YAG laser. The process involved is an optical parametric oscillation (OPO) utilizing the polariton mode scattering of LiNbO3. This tunable THz-wave source was applied to the problem of differential imaging. In a proof-of-concept experiment, we optically tagged objects embedded in a shade and measured the difference between transmittance at two wavelengths. The image of a tagged object was emphasized in comparison with that of an untagged objects. Differential THz imaging has not been reported previously, to our knowledge, mainly because of the lack of convenient tunable THz-wave sources. It seems possible to use dual-wavelength differential transmittance spectroscopy in the THz-wave region to monitor the gases in the industry.

AB - We had recently demonstrated a room temperature operated widely tunable THz-wave generation (frequency : 0.9-2.1 THz, wavelength : 140-310 μm) introducing a Si prism coupler onto a LiNbO3 crystal which was pumped by a Q-switched Nd:YAG laser. The process involved is an optical parametric oscillation (OPO) utilizing the polariton mode scattering of LiNbO3. This tunable THz-wave source was applied to the problem of differential imaging. In a proof-of-concept experiment, we optically tagged objects embedded in a shade and measured the difference between transmittance at two wavelengths. The image of a tagged object was emphasized in comparison with that of an untagged objects. Differential THz imaging has not been reported previously, to our knowledge, mainly because of the lack of convenient tunable THz-wave sources. It seems possible to use dual-wavelength differential transmittance spectroscopy in the THz-wave region to monitor the gases in the industry.

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Y2 - 20 July 1998 through 23 July 1998

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Widely tunable THz-wave generation using LiNbO3 optical parametric oscillator and its application to differential imaging

Abstract

ASJC Scopus subject areas

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Widely tunable THz-wave generation using LiNbO₃ optical parametric oscillator and its application to differential imaging